Mongolian agates are surface findings out of the northwestern and central Gobi desert. Very well known ( and highly searched for ) are the agates from Burugdi mountain in nortwestern Gobi. At this place yellowish and bluish chalcedony-nodules - very often with a botryoidal cavity in the center -  can be found. Another typical phenomenon are mossy- or fernlike structures as inclusions in the nodules. It is possible to find chalcedony-nodules sitting on early formed carbonate-aggregates.  Sometimes nodules with a nice black and white contrast can be found. Items with a fine lined fortification banding are rare.

Another agate deposit is situated at Kerulena in the eastern Gobi desert. From this location black and white banded Lithophysae (“Thunder-eggs”) are originated. Most of them show only the agatized core of the lithophysae, the surrounding rhyolithe is weathered.

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